Solder for aluminum and other metals.



UNITED STATES PATENT OFFICE.

CHARLES G: CARROLL AND WILLIAM H. ADAMS, OF FAYETTEVILLE, ARKANSAS.

SOLDER FOR ALUMINUM AND OTHER METALS.

Specification of Letters Patent.

Patented Dec. 8, 1908.

Application filed. November 19, 1907. Serial No. 402,918.

To all whom/it may concern:

Be it known that we, CHARLES G. CARROLL and WILLIAM H. ADAMS, citizens of the United States, residing at Fayetteville in the county of Washington and State of 'Arkansas, have invented certain new and useful Improvements in Solder for Aluminum and Other Metals; and we do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to certain new and useful improvements in solder, adapted for unitin aluminium surfaces and in the method of producing the same. In uniting ieces of aluminium or. other metals with so der it is necessary, as is Well understood, that the surfaces of the metal should be clean and free from oxids.

Our invention has for its object an alloy which shall be capable of cleansing the surfaces of aluminium or other metals from oxids and at the same time providing a filler which shall be capable of firmly uniting the surfaces to be joined.

With these ends in view our invention consists of an alloy com osed of calcium and some other metal whic shall have the characteristics and pro ierties of alloying 8r uniting wit-h the sur aceslof the metal to be joined. i

Our invention also consists in the method hereinafter described of combining the metals constituting our improved alloy or solder. An alloy which we have found especially adapted for the purpose consists of tin 47% per cent, lead 47% er cent. andcalcium 5 per cent. The com ination of the calcium wit-h the other metals described reduces an alloy whose oxid is formed witi a greater evolution of heat per chemically equivalent quantities than are the oxids o aluminium or other metals to be soldered and hence is capable of reducing the oxids of the metals .to be soldered through the application of Instead of usin both' tin and lead with the calcium, tin a one may be used, or any other metal or alloy capable of joining or attaching itselfto, or alloyin with aluminium or other metals when the surfaces of such metals are clean or substantially free the calcium.

The character of the metals used in connection with the calcium may vary accordingly as it may be desired to produce a hard or soft solder, and the pro ortions may like- Wise vary rovided they e such as to roduce a sol er embodying sufficient calcium to successfully free the surfaces of the metal to be united from oxids, and the other mefrom oxids may be used in connection with tallic constituents of such character and thereto, when said aluminium or. other metals are substantially free from their metallic oxids upon the surfaces that are to be-soldered, said calcium being in suflicient quantity to reduce sufficiently the oxid of said metals to be soldered, so that the binding materials will adhere thereto, substantially as described.

2. A solder for aluminium and other materials, consisting of calcium and tin, said calcium beingin sufficient quantity so as to reduce the aluminium or other metallic oxids on the surfaces of the metals to be soldered as to allow of the adherence of such solder, substantially as described.

In testimony whereof, we have signed our names to this specification in the presence of two subscribing witnesses.

. CHARLES e. CARROLL.

WILLIAM ADAMS.

Witnesses:

F. M. PoLLocK. J. C. WILLIAMS- 

